--- /dev/null
+package org.argeo.eclipse.ui;
+
+import org.eclipse.swt.events.MouseEvent;
+import org.eclipse.swt.events.MouseListener;
+
+/**
+ * {@link MouseListener#mouseDown(MouseEvent)} as a functional interface in
+ * order to use as a short lambda expression in UI code.
+ * {@link MouseListener#mouseDoubleClick(MouseEvent)} and
+ * {@link MouseListener#mouseUp(MouseEvent)} do nothing by default.
+ */
+@FunctionalInterface
+public interface MouseDown extends MouseListener {
+ @Override
+ void mouseDown(MouseEvent e);
+
+ @Override
+ default void mouseDoubleClick(MouseEvent e) {
+ // does nothing
+ }
+
+ @Override
+ default void mouseUp(MouseEvent e) {
+ // does nothing
+ }
+}